PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-08:43:00
G08     265.1          15.7                2.3 +/-   18.73       5.5 +/-   18.73  0.050 / 0.050
G10     70.4           56.2                4.8 +/-    0.72       5.7 +/-    0.72  0.040 / 0.050
G11     308.6          19.4                3.5 +/-    1.38       7.9 +/-    1.38  0.270 / 0.220
G14     271.7          64.9                4.4 +/-    0.58       4.8 +/-    0.58  0.290 / 0.430
G18     309.6          35.3                4.1 +/-    1.33       6.4 +/-    1.33  0.080 / 0.210
G20     106.3          16.2                4.2 +/-    1.10      10.2 +/-    1.10  0.100 / 0.220
G21     155.5          10.7                3.1 +/-    8.13       8.5 +/-    8.13  0.260 / 0.480
G27     227.7          12.3                5.2 +/-    4.05      13.9 +/-    4.05  0.350 / 0.460
G31     175.5          37.8                5.2 +/-    0.99       7.8 +/-    0.99  0.030 / 0.020
G32     0.0            70.4                5.3 +/-    0.49       5.6 +/-    0.49  0.030 / 0.030